class A8 {
	final double PI=3.1415926;
	public double getArea(final double r) {
       return PI*r*r;
	}
	public final void speak() {
		System.out.println("您好,How's everything here ?");
	}
}
public class Example5_9 {
	public static void main(String args[]) {
		A8 a = new A8();
		System.out.println("面积:"+a.getArea(100));
		a.speak();
	}
}
